Pump system



o. HAENTJENS PUMP SYSTEM Filed Jan. 28, 1926 2 Sheets-Sheet 1 lllllllnun INVENTOR a films/v1 EH5 ATTORNEYS Sgpt. 7 1926.

' 1,599,231 0. HAENTJENS PUMP SYSTEM Filed Jan. 28, 1926 2 Sheets-Sheet2 ll w I INVENTOR To Haznnsws JW LM ATTORNEYS primed by the action therunner casmg while Patented Sept. 7, 1926.

OTTO HAENTJ'ENS,

PUMP

vApplication filed January .My invention relates to pump systems, andparticularly to a pump system of the eneral type indicated in my PatentNo. 1,513,705, in which a centrifugal pump is of an associated suctionpump connected to the casing of the centrifugal. In systems of this typethe priming operation is eifected by exhausting air from the casing ofthe centrlfugal by the action of the auxiliary suction pump, so thatwater rises through the intake line into the casing of the centrifugal.The object of my invention it to provide means for temporarily sealingthe casing packings of the centrifugal runner shaft, so that air leakageinto the centrifugal casing is prevented during the priming operation.

When a centrifugal pump has been operated for a considerable length oftime, the usual runner shaft packings at the casing walls, wear to suchan extent that there is considerable air leakage at these points lntothe latter is being evacuated by he priming pump. This air electricalconnections leakage may be so great as to seriously retard, or evenprevent, the priming operation. To avoid this difliculty, a seal wh chis temporarily effective during the priming operation, sufiices.Moreover, inasmuch as the seal is needed only to prevent inward leakageof air, it need not-be of such character that it revents outward leakageof water when tlie pump is in'operation'.

The temporary seal may be of any appropriate character, such as a waterseal (Figs. 1 to 3) .or a 4 to 6), both of illustrated in theaccompanying drawings, in which Fig. 1 is a side elevation showing acentrifugal pump with associated temporary water seal for the stuifingboxes;

Fig. 2 is a section through one of the centrifugal pump stuffing boxes,drawn to a larger scale;

Fig. 3 is a diagrammatic .sketch of the by which the water controlled toautomatiwhich are seal means may be cally establish the seal only whilethe prim- 7 ing pump is in operation;

Fig. 1 is a section similar to Fig. 2, but showing a temporarilyoperative sealing washer; 1

Fig. 5 is a plan view thereof; and

Fig. 6 is a section on the line 6-6, Fig. 5.

The centrifugal pump comprises a casseal water pump 26. The

sealing washer (Figs.

of which I PATENT OFFICE.

OF HAZLETON, PENNSYLVANIA.

SYSTEM.

28, 1926. Serial No. 84,409.

16. Glands 1718 .bear

boxes to the interlor of the pump casing when the latter is evacuatedfor priming. The priming operation is therefore greatly retarded orfails.

To remedy this indicated in Figs. with a water chamber. 19 surroundingthe shaft 11 and having a lateral inlet 20, through which water mayenter the chamber 19 and form a seal at the stuffing box- Water issupplied to the pipe 21, branches 22 and 23 of which respectivelydeliver to funnels 2 1 and 25, which -open to the inlets 20 of theglands. Any suitable means may control the water supply through the pipe21, so that water is delivered to priming operation. For example, whenthe pipe 21 is connected to a water main, a selfclosing, solenoid-openedvalve may be used. I have shown, however, a self-contained system inwhich the pipe 22 is connected to a latter, which may be a small rotarypump, is supplied with water from a tank 27, to which drain pipes 28 and29 return the over-flow from the glands 17 and 18. The seal' water thusfollows a closed circuit, which-includes the glands. When thecentrifugal is in opera= tion, outward water leakage, from the pumpchamber through the stuffing boxes, is caught in the drains and adds tothe supply in the tank 27, thus keeping the latter full to the level ofits over-flow outlet 30.

Inasmuch as the seal to the stufling boxes only during the primingoperation, the operating solenoid 31 of switch 32 which-controls thecircuit of an electrical motor 33 for driving the seal water pump 26,may be arranged in a priming pump control circuit type shown in myPatent No.-1,513,705. In this system the priming pump control circuit 34is automatically closed and opened by a switch 35 operated by a floatinthe sump. Consequently when the sump switch difliculty in the mannerSeal glands from the 1-3, I provide each gland water is supplied 3 1ofthe general I er is' substituted for the water seal.

closes, not only is the priming pump sofiriming operationthe-waterstarted, but also that during the seal is 'establis ed"Obviously upon the automatic opening of the priming pump control circuitat-36, when the centrifugal is under way, (as explained in may patentabove mentioned) the seal water pump is also halted. If aself-closingsolenoid-operated valve is substituted for the seal water pump, as abovesuggested, the breaking of the solenoid circuit ermits the valve toautomatically close, t us shutting off the seal water supply inanalogous fashion.

less expensive arrangement is. shown in Figs. 4-6 inclusive, in which asealing wash- Here the gland 37 is of usual type and is pressed againstthe packing rings 16 by springs 38 beneath the nuts 39 on the ends ofthe bolts 40. The sealing washer 41 which prevents air leakage throughthe stufling box during the priming operation, is pressed against theend of the gland 37 b the sliding collar 42, Since the seal is nee edonly during priming, and since constantpressure of the washer againstthe glandwould cause its rapid wear, I provide 'pressu're means whichare effective only when the pump 'is not running. Q

For this purpose the collar 42 is engaged by one end of each of the leafsprings '4344, which are anchored at posite ends'to a sleeve 45, androvided inthe seal water pump,

termediate their ends with weig ts 46. The sleeve 45 maybe directly"attached to the shaft 11 of the centrifugal, or adjustably connected asshown. The adjustable connection maybe efiected through a nut 47threaded onto the exterior of the sleeve and bearing, under the thrustof the springs 4344 against the abutment ring 48 fastened by set screws49 to the shaft 11. Obviously the stress of the springs 43-44 may bevaried by screwing the nut 47 on sleeve 45. But'the nut 47 and abutment48 may be omitted; in which case the set screws"49 'will pass throughthe'sleeve 45 and" secure 43-44, and collar 42,

shaft is vlmparted it directly in predetermined position on the shaft11. p

During the priming" operation before the centrifugal is under way, antherefore whilethe shaft 11 is stationary, the springs force the sealingwasher-41against the gland 37 and revent air leakage around the shaftthrough the stuffin box. und r way, however, the rotation of the to: thes rings 43--44,' d thereon (and and centrifugal force "exerteincreased.- by the weights traction of collar 42, thus ing washer 41from wear.

Other ways of accomplishing the same result ii -accordance with thethoughts which pump casing, a s aft at which it passes throu theiropcasing a packing fort ich it passes through the casing,- an

en the pump is primed and.

46) causes the rerelieving the sealunderlie my invention, will doubtlessoccur to those dealing with the problem without departing from what 1claim as my incasing,'means for evacuating the casing, and meanstemporarlly effective to seal the packing against air leakage into thecasing during the evacuation of the latter.

2. In a priming system, a centrifugal pump casing, a shaft passingthrough the casing,

a stationary packing for the shaft point at which it passes through themeans for evacuating the casing, and

at the casing,

means for temporarily forming a waterseal at the packing during theevacuation of the casin 3. In a primin system, a centrifugal Ipassmgthrough the casing, a packing for t h the casing, means for evacuatingthe centrifugal casing, means for establishing a seal at the packing,and an electric control circuit common to said "evacuating means andseal-establishing means.

e shaft at the point 4. In a primin system, a centrifugal pump casing, as aft passing through the casing, a packing at which it passes throu hthe casing, means for evacuating the centrifugal casing, means forestablishing a flow of seal water to the packing, and an electriccontrol circuit common to said evacuating means and seal water flowmeans.

'5, In a primin system, pump casing, a s aft passm casing a packing ,forthe shaft at wh1ch itpasses through electrically operated pump thecasing of the centrifugal, an electrically operated water flow devicefor deliverin seal water to said packing, and a contro circuit commontosaid pump and water flow a centrifugal through the device forsimultaneously operating the Same. I 6. In a priming pump casing, ashaft at the point at wh electrically operated pump 'for evacuating thecasing of the centrifugal, an electrically pump for delivering sealwater to" operated said packing, andmeans for simultaneously; operatingsaid evacuating and seal water Pu 7. In combination, apump casing, arunfor the shaft' at the point at the-point the casing, an-

for evacuating, f

8. In a priming system, a centrifugal pump casing, a shaft passsingthrough the casing, a packing for the shaft at the point at which itpasses through the casing, means for evacuating the casing, means forsealing the packing against air leakage into the casing during theevacuation of the latter, and means automatically operative to renclerthe said sealing means ineffective when the pump is under Way.

9. In a priming system, a centrifugal pump casing, a shaft passingthrough the casing, a stationary packing for the shaft, a priming pumpfor evacuating the centrifugal pump casing, and means inoperative whenthe centrifugal pump is under way for sealing the casing against airleakage around the shaft.

In testimony whereof I have signed my name to this specification.

[OTTO HAENTJENS.

